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Related Concept Videos

Zygotic Development And Stem Cell Formation01:10

Zygotic Development And Stem Cell Formation

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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Cellular Differentiation00:57

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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
A zygote is a...
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Interactions Between Signaling Pathways01:19

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Cleavage and Blastulation01:33

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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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Mitogens and the Cell Cycle02:38

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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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Updated: Aug 26, 2025

The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
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Illuminating a new path to multicellularity.

Sayantan Datta1,2, William C Ratcliff2

  • 1Interdisciplinary Graduate Program in Quantitative Biosciences, Georgia Institute of Technology, Atlanta, United States.

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|October 11, 2022
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Summary
This summary is machine-generated.

A newly discovered species of multicellular bacteria expands knowledge of prokaryotic multicellularity. This finding offers insights into the evolutionary processes underlying the emergence of multicellular organisms.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Bacteriology

Background:

  • Prokaryotic multicellularity is a rare phenomenon, with limited examples known.
  • Understanding the genetic and environmental factors driving multicellularity in bacteria is crucial.

Discussion:

  • The newly identified bacterial species exhibits characteristics of multicellular organization.
  • This discovery challenges previous notions about the complexity of bacterial life.

Key Insights:

  • Provides a novel model for studying the evolution of multicellularity from unicellular ancestors.
  • Offers a unique system to investigate the mechanisms of cell-cell communication and differentiation in prokaryotes.

Outlook:

  • Further research can elucidate the specific adaptations enabling multicellularity in this species.
  • This finding may inspire new avenues for exploring microbial evolution and the origins of complex life.